Pressure transmitter with process coupling
First Claim
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1. A process transmitter for measuring a process pressure, comprising:
- a pressure sensor;
a sensor housing having a face configured to be exposed to process fluid, the face includes a face step;
a fill fluid capillary tube which couples fluid from the pressure sensor to the face;
an isolation diaphragm which isolates fill fluid in the capillary tube from the process fluid;
a diaphragm weld which attaches the isolation diaphragm to the face step offset from a plane of the diaphragm; and
a process fluid seal which seals a process fluid connection to the face of the sensor housing to thereby couple process fluid to the isolation diaphragm, the process fluid seal spaced apart in a direction perpendicular to a plane of the face from the diaphragm weld to reduce stress on the diaphragm from the process fluid seal due to a mounting force.
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Abstract
A process transmitter for measuring a process pressure includes a pressure sensor in a sensor housing. An isolation diaphragm which isolates fill fluid from process fluid is spaced apart from a process fluid seal. The spacing reduces deformation of the isolation diaphragm due to a mounting force.
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Citations
23 Claims
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1. A process transmitter for measuring a process pressure, comprising:
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a pressure sensor;
a sensor housing having a face configured to be exposed to process fluid, the face includes a face step;
a fill fluid capillary tube which couples fluid from the pressure sensor to the face;
an isolation diaphragm which isolates fill fluid in the capillary tube from the process fluid;
a diaphragm weld which attaches the isolation diaphragm to the face step offset from a plane of the diaphragm; and
a process fluid seal which seals a process fluid connection to the face of the sensor housing to thereby couple process fluid to the isolation diaphragm, the process fluid seal spaced apart in a direction perpendicular to a plane of the face from the diaphragm weld to reduce stress on the diaphragm from the process fluid seal due to a mounting force. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. A process transmitter for measuring a process pressure, comprising:
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a pressure sensor;
a sensor housing having a face configured to be exposed to process fluid, the face including a mounting portion adapted for mounting the face to a process fluid connection;
a fill fluid capillary tube which couples the pressure sensor to the face;
an isolation diaphragm which isolates fill fluid in the capillary tube from the process fluid;
a diaphragm weld which attaches the isolation diaphragm to a step in the face of the sensor housing which is offset from a plane of the diaphragm;
a process fluid seal disposed adjacent the mounting portion of the face which seals a process fluid connection to the face of the sensor housing to thereby couple process fluid to the isolation diaphragm; and
wherein the diaphragm and weld are spaced apart from the mounting portion of the face in a direction perpendicular to a plane of the face to thereby reduce stress on the diaphragm from the face due to a mounting force. - View Dependent Claims (12, 13, 14, 15, 16, 17, 18, 19)
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20. A method of coupling a process pressure to a pressure sensor in a process transmitter, comprising:
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attaching an isolation diaphragm to a step on a face of the process transmitter wherein the step is offset from a plane of the diaphragm;
providing a seal on the face of the process transmitter to seal to a process flange; and
spacing the seal apart from the isolation diaphragm in a direction perpendicular to a plane of the face to reduce deformation of the isolation diaphragm due to mounting stress. - View Dependent Claims (21, 22, 23)
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Specification